Blacklighting device and display device provided with the same

Abstract

A pseudo U-character tube system backlighting device is configured to reduce the number of inverter transformers without imposing strict limits to mutual insulation between neighboring inverter transformers. A backlighting device, in at least one embodiment, is provided with a plurality of lamps, an inverter circuit, and light emitting surfaces, wherein the plurality of lamps with which first electrodes of a first inverter transformer are connected, are continuously arranged to form a first lamp arrangement group, the plurality of lamps, with which first electrodes of a second inverter transformer are connected, are continuously arranged to form a second lamp arrangement group, and the second electrodes of the lamps belonging to the first lamp arrangement group are connected with either of the second electrodes of the lamps belonging to the second lamp arrangement group.

1 . A backlight device comprising a plurality of lamps arranged in series, an inverter circuit for generating, from input voltages, voltages for driving the lamps and a light-emitting surface for emitting light from the lamps towards outside,
 wherein the lamps each include first and second electrodes at both ends thereof in a longitudinal direction,   the inverter circuit includes first and second inverter transformers that have opposite phases to each other,   among the lamps, those with the first electrodes being connected to the first inverter transformer are arranged in sequence and form a first multi lamp array group, and those with the first electrodes being connected to the second inverter transformer are arranged in sequence and form a second multi lamp array group, and   the second electrodes of the lamps of the first multi lamp array group are connected to any of the second electrodes of the lamps of the second multi lamp array group.   
   
   
       2 . The backlight device according to  claim 1 , wherein at least the number of the first multi lamp array group or the second multi lamp array group formed in the backlight device is more than one. 
   
   
       3 . The backlight device according to  claim 2 , wherein two or more of the first multi lamp array groups and of the second multi lamp array groups are arranged in alternate order. 
   
   
       4 . The backlight device according to  claim 1 , wherein the lamps are cold cathode fluorescent lamps. 
   
   
       5 . The backlight device according to  claim 4 , wherein the cold cathode fluorescent lamps are straight fluorescent tubes that are circular in cross section. 
   
   
       6 . The backlight device according to  claim 1 , further comprising a coil for distributing an output of the inverter transformers to the plurality of lamps of the multi lamp array groups. 
   
   
       7 . The backlight device according to  claim 1 , further comprising a capacitor for distributing an output of the inverter transformers to the plurality of lamps of the multi lamp array groups. 
   
   
       8 . A display device comprising:
 a display portion; and   the backlight device according to  claim 1 , wherein the display portion is irradiated with light from the backlight device.